Diamond bar Area Code

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Diamond bar, CA area code

Diamond bar, CA is served by area code 909. This area code was initially assigned on 18-FEB-92 and has been in continuous service since 14-NOV-92, supporting the city's growing communication needs over the years.

The area code 909 is part of an overlay complex (840/909), which serves the same geographic region. This means that multiple area codes are used in the same area to accommodate the increasing demand for phone numbers.

City Name Diamond bar, CA
Area Code 909
Overlay Complex 840/909
State California
Country United State
Time Zone Pacific Standard Time (PST)
Code Type General Purpose Code
In Service Yes
Assignment Date 18-FEB-92
In Service Date 14-NOV-92
Diamond bar, CA area code